Malicious PDF — malware analysis report

Static analysis result for SHA-256 91dacaf5be8a8f44…

MALICIOUS

PDF

80.2 KB Created: 2021-09-13 23:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea7ffb09f24a3c7afc8f24bec084b296 SHA-1: a313ec878f4cb6c62192eaddd5f9af81f55f4b90 SHA-256: 91dacaf5be8a8f448b66d3bd23582d6863da5f0463c9c90797bde0b2a3a2f95c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious. The presence of multiple links, including one pointing to an IP address, suggests an attempt to redirect the user to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting for these links, common in phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://garglob.ru/uplcv?utm_term=gta+4+obb+file PDF link annotation
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f99ff927b8---kepudevadoniwazuwopisawo.pdfIn PDF document text
    • https://carlojans.com/cms/file/20764745343.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/mafulideged.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/37878327140.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/16598738779.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/wakojolokemebizigag.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/memogan.pdfPDF link annotation
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/27359716152.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333bbc1fa82---nogijewujesozejupifo.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/60465812962.pdfIn PDF document text
    • http://rnralpha.cz/res/file/2798218701.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021090221480773499.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/2736258726.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/55024584356.pdfIn PDF document text
    • http://www.77ice.com/upload/files/3034547709.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/gajabirotabitamed.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/dopewisoxoxis.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/84980018102.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/baxudaguvunatobulowuj.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/zodiz.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/79397503864.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD879 10092 bytes
SHA-256: 6427569fded6f1114ddc030ff95e6140833a78c73a5fb8b61c88a7c37b4a3168
font_01_sfnt_off0000ef22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 17484 bytes
SHA-256: 8864d10d75f64734c40cd7f05bd626db9415cfa1deffa627a7b4aa334dbbc9f3
font_02_sfnt_off00011c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1